Lithium battery positive and negative pole piece grooving device

Abstract

The utility model relates to a lithium battery positive and negative pole piece grooving device which comprises a supporting frame, a rotary cutter and a pole piece pressing roller, the two ends of the rotary cutter are arranged in the supporting frame, one end of the rotary cutter is connected with a first driving mechanism, and the other end of the rotary cutter is connected with a second driving mechanism. The first driving mechanism drives the rotary cutter to rotate relative to the support frame; the pole piece pressing roller is located on the side, away from the supporting frame, of the rotary cutter, a gap allowing the pole piece to pass through is formed between the pole piece pressing roller and the rotary cutter, the size of the gap can be adjusted, and relative movement in the length direction of the pole piece is kept between the pole piece and the rotary cutter. According to the utility model, the rotary cutter continuously rotates in the grooving process, so that the situation that coating chips separated after grooving are accumulated at the front end of the cutter is effectively avoided; and the size of a gap between the pole piece compression roller and the rotary cutter can be quickly and conveniently adjusted according to actual requirements.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, in particular to a positive and negative electrode slot device for a lithium battery. Background Art

[0002] In order to further improve the energy density and cycle life of commercial lithium batteries, in addition to optimizing the battery structure and improving the manufacturing process, grooves will be created on the positive and negative electrode coatings to improve the electrolyte wetting uniformity, electrolyte wetting speed and electrolyte storage capacity. The existing industry often uses laser etching to create grooves, but laser etching is inefficient and costly, and the heat-affected zone generated during the etching process has a negative impact on the electrode coating.

[0003] Therefore, in recent years, there has been a method of using a rotating tool with a sharp portion to perform a groove operation on the coating of the pole piece to form a groove on the coating on the surface of the pole piece. For example, Chinese invention patent CN109390558B discloses a lithium-ion battery pole piece and a manufacturing method thereof, which uses a cutting device to cut the particle coating on both sides of the pole piece to form a plurality of linear scratches arranged at intervals; specifically, the cutting device includes a clamping mechanism, a rotating tool and a roller, the rotating tool includes a plurality of blades arranged at intervals along the axial direction of the roller, each of the blades is movably embedded in the clamping mechanism, and the clamping mechanism can accurately adjust the extension length of the blade to ensure the distance between the blade and the roller to prevent the blade from scratching the pole piece. It can be seen that the slicing device uses a fixed blade to slicing the movable electrode. The coating debris separated after slicing is easy to accumulate at the front end of the blade, which needs to be cleaned manually regularly, otherwise it will affect the subsequent slicing operation; and when it is necessary to adjust the distance between the blade and the roller according to the thickness of the electrode and the depth of the scratch, it is necessary to stop the machine and then adjust the length of the blade extending out of the clamping mechanism one by one, which is inefficient and difficult to ensure that the length of all blades extending out is completely consistent. Moreover, for non-continuously coated electrode (i.e., intermittently coated electrode, see Figure 2 ), it is difficult for the cutting device to perform intermittent cutting operations in which the coated electrode area is cut and the uncoated electrode area is not cut.

[0004] Therefore, it is necessary to provide a technical solution to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a device for cutting grooves of positive and negative electrode sheets of lithium batteries, which can solve the technical problems in the prior art that coating debris after cutting is easy to accumulate at the front end of the blade, the relative position adjustment between the cutting blade and the electrode sheet is time-consuming and labor-intensive with low precision, and the electrode sheet with non-continuous coating cannot be cut.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A device for engraving grooves on positive and negative pole pieces of a lithium battery comprises a support frame, a rotating tool and a pole piece pressing roller, wherein both ends of the rotating tool are arranged in the support frame, and one end of the rotating tool is connected to a first driving mechanism, and the first driving mechanism drives the rotating tool to rotate relative to the support frame; the pole piece pressing roller is located on the side of the rotating tool away from the support frame, and a gap is formed between the pole piece pressing roller and the rotating tool for the pole piece to pass through, and the size of the gap is adjustable, and the pole piece and the rotating tool maintain relative movement along the length direction of the pole piece.

[0008] Furthermore, the rotary tool comprises a cutter shaft, on which a plurality of blades are detachably provided along an axial direction; both ends of the cutter shaft are arranged in the support frame, and one end of the cutter shaft is connected to the first driving mechanism.

[0009] Furthermore, a spacer sleeve is provided between adjacent blades, and the spacer sleeve is detachably connected to the blade shaft.

[0010] Furthermore, first bearing seats are provided at both ends of the support frame, and both ends of the rotating tool are respectively arranged in the first bearing seats through first bearings.

[0011] Furthermore, it also includes a second driving mechanism for adjusting the gap size, and the second driving mechanism is connected to the pole piece pressing roller.

[0012] Furthermore, second bearing seats are arranged at both ends of the pole piece pressure roller, and both ends of the pole piece pressure roller are arranged in the second bearing seats respectively through second bearings; and the second driving mechanism is connected to the second bearing seat.

[0013] Furthermore, it also includes a controller and a detection mechanism, and the detection mechanism and the second driving mechanism are both controlled and connected to the controller; the detection mechanism is arranged at the outlet end of the gap and is used to detect the size of the groove formed on the pole piece, and the detection mechanism feeds back the detection result to the controller, and the controller controls the second driving mechanism according to the feedback result.

[0014] Furthermore, it also includes a transmission mechanism for driving the pole piece to move along its length direction, and the transmission mechanism includes a unwinding roller arranged on one side of the support frame and a winding roller arranged on the other side of the support frame.

[0015] Furthermore, a negative pressure dust suction mechanism opposite to the rotating cutter is also provided in the support frame.

[0016] Furthermore, the negative pressure dust suction mechanism includes a dust suction port opened in the support frame and a funnel connected to the dust suction port, the dust suction port is arranged opposite to the rotating tool, a material receiving frame is arranged at the bottom of the funnel, and a negative pressure fan is arranged in the funnel.

[0017] The beneficial effects of the utility model are as follows:

[0018] (1) During the groove carving process, the first driving mechanism drives the rotary tool to continuously rotate at a uniform speed, that is, the blades on the peripheral side of the rotary tool contact the pole piece in turn, thereby preventing the coating debris separated after the groove carving from accumulating at the front end of the tool, ensuring that the groove carving operation is carried out normally;

[0019] (2) The pole piece pressing roller is driven to move up and down relative to the rotating tool by the second driving mechanism, so that the gap between the pole piece pressing roller and the rotating tool can be quickly and conveniently adjusted according to the thickness of the pole piece and the requirement for the groove depth; further, the position of the pole piece pressing roller can be dynamically adjusted during the groove engraving process to achieve an intermittent groove engraving operation in which the coating area is grooved and the non-coating area is not grooved;

[0020] (3) According to the specific requirements for the spacing between adjacent grooves in actual production, spacers of corresponding sizes are arranged between adjacent blades, so that the spacing between adjacent blades meets the requirements of the grooves. Therefore, it is only necessary to replace spacers of different sizes to meet the requirements of different groove spacings, and there is no need to prepare different rotating tools for different groove spacings. The invention has strong applicability and low cost.

[0021] (4) The size of the groove formed on the pole piece is detected by the detection mechanism, and the detection mechanism feeds back the detection result to the controller in real time. The controller controls the action of the second driving mechanism in real time according to the feedback result, thereby effectively ensuring the accuracy of the groove on the pole piece;

[0022] (5) When the rotating tool grooves the electrode, the coating debris generated enters the dust suction port under the suction of the negative pressure fan, and finally falls into the receiving frame along the funnel, preventing the coating debris from floating in the air and polluting the environment, and also preventing the coating debris from adhering to the electrode or the rotating tool and affecting the product quality. The staff only needs to clean the coating waste in the receiving frame regularly, without spending a lot of time cleaning the electrode and the rotating tool, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the continuously coated electrode of the utility model.

[0024] Figure 2 It is a schematic diagram of the structure of the discontinuously coated pole piece of the utility model.

[0025] Figure 3 It is a front view of the positive and negative electrode groove device of the lithium battery of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the positive and negative electrode groove device of the lithium battery of the present invention.

[0027] Figure 5 It is a partial structural schematic diagram of the rotary tool of the utility model.

[0028] Description of reference numerals:

[0029] 1-support frame; 11-bearing seat; 2-rotating tool; 21-knife shaft; 22-blade; 23-spacer; 3-pole piece pressure roller; 4-first driving mechanism; 5-pole piece; 51-groove; 6-first bearing; 7-second bearing seat; 8-second bearing; 9-negative pressure dust suction mechanism; 91-dust suction port; 92-funnel; 93-material receiving frame. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0031] like Figures 1 to 5 As shown, the utility model provides a device for notching positive and negative electrodes of a lithium battery, a device for notching positive and negative electrodes of a lithium battery, comprising a support frame 1, a rotating tool 2 and a pole piece pressing roller 3, both ends of the rotating tool 2 are arranged in the support frame 1, and one end of the rotating tool 2 is connected to a first driving mechanism 4, the first driving mechanism 4 drives the rotating tool 2 to rotate relative to the support frame 1; the pole piece pressing roller 3 is located on the side of the rotating tool 2 away from the support frame 1, a gap is formed between the pole piece pressing roller 3 and the rotating tool 2 for the pole piece 5 to pass through, and the size of the gap is adjustable, and the pole piece 5 and the rotating tool 2 maintain relative movement along the length direction of the pole piece 5. Specifically, the rotating tool 2 is arranged on the upper side of the supporting frame 1, and the pole piece pressing roller 3 is arranged on the upper side of the rotating tool 2; the first driving mechanism 4 can be a driving mechanism that outputs rotational motion such as a motor, a hydraulic motor, etc., preferably, the first driving mechanism 4 is a motor.

[0032] In actual applications, the pole piece 5 passes through between the pole piece roller 3 and the rotating tool 2. The gap between the pole piece roller 3 and the rotating tool 2 is adjusted according to the thickness of the pole piece 5 and the requirement for the depth of the groove 51. Specifically, the rotating tool 2 can be moved relative to the pole piece roller 3 to adjust the gap, or the pole piece roller 3 can be moved relative to the rotating tool 2 to adjust the gap. In this embodiment, it is preferred to use a second drive mechanism connected to the pole piece roller 3, and the pole piece roller 3 is driven by the second drive mechanism to move up and down relative to the rotating tool 2 to adjust the gap. The pole piece roller 3 drives the pole piece 5 closer to or away from the rotating tool 2 under the drive of the second drive mechanism; the first drive mechanism 4 drives the rotating tool 2 to rotate at a uniform speed, and at the same time, the pole piece moves at a uniform speed relative to the support frame 1 along its length direction. As the pole piece 5 moves, the rotating tool 2 performs a groove operation on the surface of the pole piece 5 to form a linear groove on the surface of the pole piece 5. Figure 3-4 As shown, the pole piece 5 is half wrapped on the pole piece pressing roller 3, which effectively prevents the pole piece 5 from shaking, thereby improving the stability of the groove processing and ensuring the effect of the groove processing. Figure 1 ), after the gap is adjusted, the size of the gap is kept unchanged during the groove processing to ensure that the rotating tool 2 forms a groove 51 with a uniform depth on the rolled pole piece 5; when facing a non-continuously coated pole piece 5 (see Figure 2 ), according to the running speed of the pole piece 5, and the length of the coated area and the length of the non-coated area in the pole piece 5, the second driving mechanism drives the pole piece pressing roller 3 to approach the rotating tool 2 at a certain time interval so that the pole piece 5 contacts the rotating tool 2 and performs a groove operation on the coated area. The second driving mechanism also drives the pole piece pressing roller 3 away from the rotating tool 2 at a certain time interval so that the pole piece 5 leaves the rotating tool 2 and does not perform a groove operation on the non-coated area.

[0033] In this embodiment, during the grooving process, the first driving mechanism 4 drives the rotating tool 2 to continuously perform uniform rotational motion, that is, the blades on the circumferential side of the rotating tool 2 contact the pole piece 5 in turn, thereby avoiding the accumulation of coating debris separated after grooving at the front end of the tool, thereby ensuring the normal grooving operation; and the pole piece pressing roller 3 is driven by the second driving mechanism to move up and down relative to the rotating tool 2, so that the gap size between the pole piece pressing roller 3 and the rotating tool 2 can be quickly and conveniently adjusted according to the thickness of the pole piece 5 and the requirement for the depth of the groove 51; further, the position of the pole piece pressing roller 3 can also be dynamically adjusted during the grooving process to achieve intermittent grooving operation in which grooving is performed on the coated area and no grooving is performed on the non-coated area.

[0034] Furthermore, it also includes a controller and a detection mechanism (not shown in the figure), and the detection mechanism and the second drive mechanism are both connected to the controller; the detection mechanism is arranged at the outlet of the gap and is used to detect the size of the groove 51 formed on the pole piece 5, and the detection mechanism feeds back the detection result to the controller, and the controller controls the second drive mechanism according to the feedback result. Specifically, the detection mechanism is a line spectrum detection mechanism or a line laser detection mechanism, which is located at the outlet of the gap and close to one side of the pole piece roller 3. When the pole piece 5 comes out of the gap, the detection mechanism can detect the depth and width of the groove on the pole piece 5, and feed back the detection structure to the controller in real time. The controller controls the second drive mechanism in real time according to the detection result, and the second drive mechanism drives the pole piece roller 3 to move up and down relative to the rotating tool 2 to adjust the gap, thereby ensuring that the size of the groove 51 on the pole piece 5 meets the requirements and improving the forming accuracy.

[0035] Further, see Figure 5 The rotary cutter 2 comprises a cutter shaft 21, on which a plurality of blades 22 are detachably arranged along the axial direction; both ends of the cutter shaft 21 are arranged in the support frame 1, and one end of the cutter shaft 21 is connected to the first driving mechanism 4. Preferably, a spacer 23 is arranged between adjacent blades 22, and the spacer 23 is detachably connected to the cutter shaft 21.

[0036] In this embodiment, by detachably setting a plurality of blades 22 on the blade shaft 21, it is convenient to replace blades 22 of different materials or different sizes according to actual needs, and it is also convenient to replace a single blade 22 when a blade 22 is damaged, thereby saving maintenance costs. In addition, in actual production, according to the specific requirements for the spacing between adjacent grooves 51 in actual production, spacers 23 of corresponding sizes are set between adjacent blades 22, so that the spacing between adjacent blades 22 meets the requirements of the grooves 51. Therefore, it is only necessary to replace spacers 23 of different sizes to meet the requirements of different groove spacings, and there is no need to prepare different rotary cutters 2 for different groove spacings, which has strong applicability and low cost.

[0037] Furthermore, the blade 22 is a circular blade. In this embodiment, the blade 22 is specifically set as a circular blade, and a blade is provided on the circumferential surface of the circular blade. During the groove carving process, the blade 22 rotates following the blade shaft 21. Since the distance between the blades at various locations on the circumferential surface of the circular blade and the central axis of the blade shaft 21 is consistent, the depth of the groove 51 formed on the pole piece 5 by the blades at various locations on the circumferential surface can be ensured to be consistent, thereby ensuring the processing accuracy.

[0038] Furthermore, first bearing seats 11 are provided at both ends of the support frame 1, and both ends of the rotating tool 2 are respectively provided in the first bearing seats 11 through first bearings 6. In this embodiment, the provision of the first bearing seats 11 and the first bearings 6 facilitates the first driving mechanism 4 to drive the rotating tool 2 to perform a rotating motion.

[0039] Further, the pole piece pressing roller 3 is provided with a second bearing seat 7 at both ends, and the pole piece pressing roller 3 is respectively provided in the second bearing seat 7 through a second bearing 8; the second driving mechanism is connected to the second bearing seat 7. In this embodiment, by providing the second bearing seat 7 and the second bearing 8, the pole piece pressing roller 3 follows the pole piece 5 in rotational motion during the movement of the pole piece 5 along its length direction, which is conducive to the smooth movement of the pole piece 5. Specifically, a fixed frame (not shown in the figure) is arranged above the support frame 1, and the second bearing seats 7 at both ends are slidably arranged in the fixed frame. The second driving mechanism can be a driving mechanism of the type of hydraulic cylinder, electric push rod, motor screw, etc.; in this embodiment, preferably, the second driving mechanism (not shown in the figure) includes a servo motor, a screw connected to the output end of the servo motor, and a screw nut arranged in the fixed frame. A driving plate is connected between the second bearing seats 7 at both ends, and the other end of the screw passes through the screw nut and is rotatably connected to the driving plate. When the position of the pole piece roller 3 needs to be adjusted, the servo motor drives the screw to rotate. Due to the action of the screw nut, the screw moves up and down along its axial direction, thereby driving the pole piece roller 3 to move up and down, and the servo motor can accurately adjust the position of the pole piece roller.

[0040] Furthermore, a transmission mechanism (not shown in the figure) is included for driving the pole piece 5 to move along its length direction, and the transmission mechanism includes an unwinding roller arranged on one side of the support frame 1 and a winding roller arranged on the other side of the support frame 1. In this embodiment, through the cooperation of the unwinding roller, the winding roller and the pole piece pressing roller 3, the pole piece 5 is automatically moved at a uniform speed along its length direction, and the pole piece 5 can be tensioned to ensure the groove effect.

[0041] Furthermore, the support frame 1 is also provided with a negative pressure dust suction mechanism 9 opposite to the rotating tool 2. Preferably, the negative pressure dust suction mechanism 9 includes a dust suction port 91 opened in the support frame 1 and a funnel 92 connected to the dust suction port 91. The dust suction port 91 is arranged opposite to the rotating tool 2. A material receiving frame 93 is arranged at the bottom of the funnel 92. A negative pressure fan (not shown in the figure) is arranged in the funnel 92. In this embodiment, specifically, the dust suction port 91 is arranged directly below the rotating tool 2. During the process of the rotating tool 2 grooving the pole piece 5, the coating debris generated enters the dust suction port 91 under the suction of the negative pressure fan, and finally falls into the material receiving frame 93 along the funnel 92, preventing the coating debris from floating in the air and polluting the environment, and also preventing the coating debris from adhering to the pole piece 5 or adhering to the rotating tool 2, affecting the product quality. The staff only needs to clean the coating waste in the material receiving frame 93 regularly, without spending a lot of time cleaning the pole piece 5 and the rotating tool 2, saving time and effort.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A device for engraving grooves for positive and negative electrodes of a lithium battery, comprising a support frame (1), characterized in that: It also comprises a rotating tool (2) and a pole piece pressing roller (3), wherein both ends of the rotating tool (2) are arranged in the support frame (1), and one end of the rotating tool (2) is connected to a first driving mechanism (4), and the first driving mechanism (4) drives the rotating tool (2) to perform a rotating motion relative to the support frame (1); the pole piece pressing roller (3) is located on a side of the rotating tool (2) away from the support frame (1), a gap is formed between the pole piece pressing roller (3) and the rotating tool (2) for the pole piece (5) to pass through, and the size of the gap is adjustable, and the pole piece (5) and the rotating tool (2) maintain relative motion along the length direction of the pole piece (5).

2. The lithium battery positive and negative electrode groove device according to claim 1, characterized in that: The rotary tool (2) comprises a tool shaft (21), on which a plurality of blades (22) are detachably arranged along an axial direction; both ends of the tool shaft (21) are arranged in the support frame (1), and one end of the tool shaft (21) is connected to the first driving mechanism (4).

3. The lithium battery positive and negative electrode groove device according to claim 2, characterized in that: A spacer sleeve (23) is provided between adjacent blades (22), and the spacer sleeve (23) is detachably connected to the blade shaft (21).

4. The lithium battery positive and negative electrode groove device according to claim 1, characterized in that: First bearing seats (11) are arranged at both ends of the support frame (1), and both ends of the rotating tool (2) are arranged in the first bearing seats (11) respectively through first bearings (6).

5. The device for engraving grooves for positive and negative electrodes of a lithium battery according to claim 1, characterized in that: It also comprises a second driving mechanism for adjusting the size of the gap, wherein the second driving mechanism is connected to the pole piece pressing roller (3).

6. The device for engraving grooves for positive and negative electrodes of a lithium battery according to claim 5, characterized in that: Second bearing seats (7) are provided at both ends of the pole piece pressure roller (3); the two ends of the pole piece pressure roller (3) are respectively arranged in the second bearing seats (7) via second bearings (8); and the second driving mechanism is connected to the second bearing seat (7).

7. The lithium battery positive and negative electrode groove device according to claim 5, characterized in that: It also includes a controller and a detection mechanism, wherein the detection mechanism and the second driving mechanism are both connected to the controller for control; the detection mechanism is arranged at the outlet end of the gap and is used to detect the size of the groove (51) formed on the pole piece (5); the detection mechanism feeds back the detection result to the controller, and the controller controls the second driving mechanism according to the feedback result.

8. The lithium battery positive and negative electrode groove device according to claim 1, characterized in that: It also comprises a transmission mechanism for driving the pole piece (5) to move along its length direction, the transmission mechanism comprising an unwinding roller arranged on one side of the support frame (1) and a winding roller arranged on the other side of the support frame (1).

9. The lithium battery positive and negative electrode groove device according to claim 1, characterized in that: The support frame (1) is also provided with a negative pressure dust suction mechanism (9) opposite to the rotating cutter (2).

10. The lithium battery positive and negative electrode groove device according to claim 9, characterized in that: The negative pressure dust suction mechanism (9) comprises a dust suction port (91) provided in the support frame (1) and a funnel (92) connected to the dust suction port (91); the dust suction port (91) is arranged opposite to the rotating cutter (2); a material receiving frame (93) is arranged at the bottom of the funnel (92); and a negative pressure fan is arranged in the funnel (92).

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